Abstract: Objective To evaluate two methods applied to simulation training of vacuum delivery. Methods A total of 49 residents were randomly divided into two groups. One group was given on-site instruction by directors and hands-on demonstration (referred to as “tutor group”) and the other group was given demonstration through video (referred to as “video group”). Before and after the training, the two groups were surveyed with a self-confidence questionnaire. Written examination was implemented and compared results of group trained by vedio demonstration and the group of on-site instruction by tutors. The practical operation was evaluated by the Objective Structured Assessment of Technical Skills (OSATS). Results The on-site instructed group had a significantly higher score than that of the video group (4.96±0.20 vs 4.68±0.48, P＜0.05). The score of written examination of on-site instructed group was significantly higher than that of the video group (83.00±7.18 vs 70.56±10.37, P＜0.001). In the OSATS, the score of equipment integrity in on-site instrcted group was significantly higher (0.96±0.20 vs 0.52±0.51 P＜0.01), the correct placement of the flexion point (0.50±0.51 vs 0.08±0.28, P＜0.01) and the Objective total score (6.79±1.02 vs 5.32±0.95, P＜0.001) of on-site instructed group were all The same phenomenon was also found in the soft tissue clamping (0.63±0.50 vs 0.32±0.48, P＜0.05). Conclusions The on-site and tutor instructed simulation training has shown a better outcome comparing to the video demonstration . However,both groups can enhance the students'confidence in learning and using operative vaginal delivery skills.

Key words: simulation training, operative vaginal delivery, Objective Structured Assessment of Technical Skills, vacuum delivery